Knife sharpener for slicing machines



Aug. 12, 1930. 'w. J. CAMPBELL ,11

7 KNIPBSHARPHER FOR SLICING ucamzs Filed July 8, 192'! s Shoots-Shoot 1 J/far/zys mum! w. J. AMPBELL KNIFE SHARPBNER FOR SLIGING IAGHIHIS Filed July 8, 1927 3 Shah-Shut 2 H I V L III/ Ing is I 4 Ill w. J. CAMPBELL 1mm: srumrnusn FOR sucme nonmas Filed July 8, 1927 V.

3 Sheets-Sheet 3 Patented Aug. 1 2, .1930 I UNITED' STATES PATE me MACHINE company,

NT OFFICE ASSIGNOR TO AMERICAN sLIo- CORPORATION on NEW YORK snnnrnnnn FOR sLIcINo MACHINES Application med m a, 1927. Serial No. 204,209.

My invention relates to a slicing machine, having a rotary knife, and relates-particularly to means for sharpening said knife in response to the rotation thereof. A particular purpose is the provision of grinding or sharpening means which shall be effective to sharpen the knife, while preventing the formation of aburr upon the knife edge. Another object is the provision of sharpening means including opposed'grinding andburr removing members on opposite sides of'the knife. Another purpose is the provision of such opposed sharpening and burr removing means, and means for effecting the engagement of said burr remover prior to the engrinding member, and for gagement of said holding said burr remover in engagement with the knife until after the grinding memher is removed from operative engagement therewith. e a

I illustrate my invention more or less diagrammatically in the accompanying drawings, wherein' I Figure 1 is an elevation; Figure 2 is a section on the line of Figure 1; 1 Figure 3 is a sect-ion on the-line 33 of Figure 2;

Figure 4 is a section on the line 4-4 of Figure 2; I V

Figure 5 is a detail elevation; I Figure dis avertical section [on an'enlarged scale through the structure shown in Figurefi; 1 1 m Figure 7 is a similar section with the parts in a different position;

V Figure 8 is a view of a variant form-of my device; r

Figure 9 is a section on the line 99-of Figure 8; r v

Figure 10 is a section on the line 10-10 of Figure 9;

Figure 11 is a similar view with the parts in a different position; i

Figure 12 is asection on the line 1212 of Figure 10;

Figure 13 is a Figure 9; and v Figure 14 is a detail.

section on the line 13-13 of ,channelB C is a knife supporting sleeve mounted on the inner sleeve D on which are mounted the I is the sleeve G? rounded at the opposite end withdrawn Like parts throughout the specification and drawings.

A generally indicates any suitable base frame or member, provided for example with the supporting studs A f y suitable motor means may be provided, not herein shown, foractuating the driving belt B, herein shown as of triangular cross-section, to engage the inclined faced on the pulley B the base Aand including the shield portion t Mounted within the sleeve portion Cris ball bearing tracks D -to support the balls D opposed to the inner tracks D? on the knife I shaft D. D are locking nuts whereby to secure the knife shaft and roller bearing togetl1er,the shaft D being enlarged as at D to engagev the inner forward ball track D it proper, securedto the a E is theiknife disc shaft assembly for example by the screw E andadditionally secured to the pulley B for example by the screws E The knife disc is shownas convex and is peripherallg cut away, I 4

or recessed on its hollow face as at to leave a peripheralportion E projecting somewhat forwardly from the faceof the knife.-

G generally indicates a sharpener housing having a cover plate G Associated with it in whichis mounted the bearing G? in which rotates the shaft G to the end are indicated bylike symbols of which is secured the grindingelement G by means of the screw G. 'The shaft G4 is enlarged atthe grinder end i as atG G is aninnerba-ll racemember and G an outer ball, race member, having between them the ballbea-rings G G12 is a coil spring compressed between the the outer ball race tending to move the grinding member G into position, as shown in Figure 3.

t Mounted for axial movement in the housing member G is the push rod H which is provided with the manual knob Ht. At its inner end is the convex member H opposed to the rounded end G rof the shaft G. Mounted on the stem of the rod H is a collar I H which is provided with a lateral projecas atGr and is hearing member G and I G, thereby normally isrotatable the shaft I "burr removing member I ing-member 1 toward the I Figure 4, the line' of the knife being diagramforming bearing 1 eluding the boss L and L.

in it is the tube L to the upper end of which is j secured the external knob L in one direction is limited by the terminal.

" end of the pin of the member L.

moving member M tion or lug H channeled as at H to engage the stop H which serve to prevent rotation o the collar and of the shaft H, limiting it to axial movement. H is a second lateral projection or lug extending in a different direction from the rod H, as shown in Figure 7.

Amociated with the housing G is a second sleeve I, having the bearing lug I in which I which carries the which may for exan'iple'be a steel disc. The opposite end 0 the shaft is roundedas at I. I is an inner 'ball race and 1 an outer ball race, between which are the bearing balls I I is a coil spring compressed between the bearing memberIand the outer ball race I and which is adapted normally to draw the burr removknife, as shown in matically indicated in Figures 3 and 4 as Mounted for rotation in the housing Gr is the rodK which is provided with the external control handle K with the ball weight K wherebyit may be rotated. It is provided with a worm ortion K mounted in the conand rotation in the opposite direction retracts it. K is a convex en portion in contact with the rounded end I of the Shaft 1 Mounted on the rodK is the disc or collar l (which is provided with a notch or cut away fieferring to Figures 8 to lainclusive L housing secured to the nerally indicates a ame as by the screws L L generally indicates the interior supporting member in- L is a bearing member integral with the bossL Slidahle flange Its movement in the opposite directlon islimited by. the flange L between whichand the boss L is compressed the coil spring L whichnormally tends to with- Rotat- (lraw the member L from the knife.

fable within the member L is the pin L to as which is secured the grinding member L. L is a bearin ball interposed between the and the end of the interior L is a movement limiti'ng ball opposed to the reduced portion L of the pin L, which is adapted to prevent outward movement ofthe pin L in relation to themember L.

. Mounted for rotation in the boss L is the pin M upon which is mounted the burr ref ure 14. The cam O At all other positions of the cam member K whereby rotaj tion in one direction advances the rod K toward the shaft I mall'y shown inFigure 10, with the stop cam sition of parts without Its movement I and holding the burr in shown they weight K It is normally thrust in the direction of the knife as by the spring M engaging the collar M between which and the end of the pin M is any suitable autifriction device M herein shown as a ball bearing assembly.

0 indicates a pin mounted for rotation in the supporting assembly L At its outer end is the manual lever Q. Mounted upon it intermediate its ends is the cam member "en'- erally indicated as O and illustrated in igincludes the hub portion the portions 0 and O lying in planes at right angles to the axis of the pin 0 and-the: intermediate inclined cam portion 0". O is a stop member lying in a plane inwhich lies the axis of'the pin 0 and O is an outward stop extension of the surface 0*. and it will be noted that when the knob L The member 0 is cut away as at O is aligned with the cut away portion 0 it is possible for the operator to thrust the grinding member-L into contactwith the knife. the knob L engages the edge of the member 0 and is held against movement toward the knife. 0 indicates a tension soring adapted norto rotate the cam into the position 0 in engagement with the member L.

- It will be realized scribed and shown a practical and operative device nevertheless many changes might be made in the size, shape, number and dispospirit of my invention. I therefore wish my description and drawings to be taken as in a broad sense illustrative and diagrammatic rather than as limiting me to my specific showing.

The use and operation of my invention are as follows:

The" grinding member G is normally held 3 in withdrawn position by action of the spring G; In order thrust it against the knife it is necessary for the operator to exert pressure against the knob H and thus to move the pin H longitudinally in its bearings. However, in sharpening the knife the engagement of the grinding mally results in the formation of a burr. In order to prevent such burr formation I provide the burr remover I which may be a steel disc, and which is drawn against the opposite side of the knifeby action of the spring 1 In order to hold the burr remover normally out of contact with the knife I provide the member K with the worm K the convex member K of which normally contacts the end I of the shaft 1, resisting the spring remover in inoperative position. In the form of my device heretends to rotate the pin K into position, to hold the burrwithdrawn from the knife. Referring to Figure 5, when the weight K is in the position shown that whereas I have dedeparting from the.

disc with the knife edge nornotch K theoperator can exert manual pressure in the formof the device thrust the grinding the beveled side of the knife. The" operator,

,relaxed the spring G at the same time thrusts the pin position, the spring I grinding disc,

withdrawn from the disc has been thrustthereagainst.

in full line the member K is advanced and the burr remover is out of contact with the knife. The weight K is sufficient to resist the expansion of the spring 1 7 When it is Y desired to permit the burr removerto engage burr remover maintain contact with the knife.

until after the grinding member is withdrawn therefrom. I thereforeassociate with the burr remover means for preventing engagement of the grinding member with the knife until the burr remover has been released for knife engagement. In the form herein shown I employ the collar ordisc K".

Figure 7 that When in the position shown in to the dotted is to say with'the lever raised line position of Figure 5, theburr remover is released for knife engagement and the is in line with the lug H sothat herein shown,in order to (liSC G positively against having raised the lever K 'and having exerted pressure against t'he'knob H can then loose the lever K ,.-as theengagcment of. the lug H with notch Kl will prevent retrograde movement of the lever. .Theoperator continues exertingfpressure against the knob H tain the desired result.

applying sufiicient pressure to ob- When pressure is expands, withdraws the discG from contactwith the knife," and v H tothe right as shownin Figure 3. As soon as the pin has moved a sufficient distance to disengage the lug the weight of the lever K and the weight K rotates the pin K into operative after the disengagement of the is itself 'moved out of contact with the knife. The arcuate cut away portion K serves to hold the rotation of the burr remover,

a pin K to have the desired limits.

It will be clear from the above description and the drawings that in the normal operation of my device it will be impossible for an operator to thrust the grinding disc against the knife until after theburr remover has engaged the knife. Also, it will be impossible to cause the burr remover to recede from the knife until'after the grinding disojhas been knife, once the grinding Furthermore, the thrust .ofthe burr remover against the knife is fixed, and is entirely out of the control of the operator. In practice this is a .considerableadvantage, since, the burr remover,.or the thrust of the to remove the burr,

ber in such is compressed, and the spring which controls it, may be set or controlled at the factory at the proper strength 7 and the careless user has no opportunity to exert an unnecessarily; strong thrust against the knife.

The angularity of the grinding and burr removing Eis illustrated in Figures 2, 3 and 4; the pur: pose of which is to have each sharpening element contact the knife only at one point. As indicated in Figure 1, the grinding member G when in operation touches the knife at the point Y, the burr removing discI contacts the knife at the point Z, thereby rotating the sharpening elements in the directions asv shown by arrows. In praoticeI have found the angles most suitable to give'the desired results, for the grinding member to be 12 in the horizontalplane and 12 in the vertical plane, for the burr removing disc I to be 7 in the horizontal plane and 3 f in'the vertical plane. l

elements towardsthe rotary knife Referring to the structure of Figures Sto 13, the spring L in'g member L The spring 0 normally holds the grindnormally holds the cam memposition that the stop 0 is 1n engagement with the member L The edge of the portion O of the cam serves as a positive stop to prevent any movement of the knob L or the member L and thus of the grinding member L in the direction of the knife. The spring 'M tends normally to move the burr removing member M toward the knife but the portion 0 of the cam member 0 is interposed to hold the meme ber M withdrawn, and of course the spring 0 is strong enough to overcome the thrust of the spring M Thus both elements are positively locked against forward movement toward the knife.

When the operator rotates the lever O to the position shown in dotted line in Figure 8 the cam is thereby rotated to release the burr removing member M for engagement with the knife. lVhen the lever is in the dotted line position the inner end of the pin M is opposed to the member 0 of the cam member 0 which is so proportioned as to permit engagement of the burr remover with the knife. I

At the same time the cut away portion 0 is brought into alignment with the knob L and it is then possible for the operator to overcome the force of the spring L by thrusting positively against the knob. Thus a moveme'nt'of the lever O to dotted line position causes the'burr remover M to move into contact with the knife. under thrust of the spring M Thereafter the operator can manually overcome the thrustvofthe spring L 9. This disposition insures that the burr remover will engage the knife before the withdrawn from the knife} side of the knife edge, a

said yielding means,

knife, a grinding element opposed to the ophaving a rotary knife and drawn for once the knob L has been thrust inwardly into the plane of the cam member O,the cam cannot rotate into the full line position, since the opposition of the knob L to the cut away portion 0 serves asa stop to resist the action of the spring 0 1. In association with a slicin mach ne having a rotary knife and means f or driving it, a burr removing element opposed to one control member therefor, yielding means tending normally to thrust said burr removing element toward the knife, locking means to hold said burr removing element, against out of contact with the posite side of the knife, a control member therefor, yielding means normally holding said grinding element out of contact with the knife, an external control means for thrusting said grinding element, against such yielding means, toward the knife, and means for preventing the application of the grinder to the knife when the burr remover is out of contact with the knife, comprising a projection on said grinder control pin. an opposed locking member on the burr remover control member, said locking member being adapted to permit the passage of said projection. when the burr remover isin operative position.

2. In association with a slicing machine having a rotary knife and means for driving it, a burr removing element opposed to one side of the knife edge, a rotatable control member therefor, yielding means tending normally to thrust said burr removing element toward the knife, locking means adapt-- ed to hold said burr removing element normally in inoperativeposition, means for rotating said control member into release position, a grinding element opposed to the opposite side of the knife, a control member therefor, and means for preventing the approach of the grinder to the knife when. the burr remover is out of contact with the knife, said means including a knob on the grinder control member, and a flange on the burr remover control member, said. flange being adapted normally to prevent the movement of said knob toward the knife, but to permit its passage when the burr remover control member is rotated into release position;

3; In association with a slicing machine means for driving it, sharpening members adapted to engage opposite sides of the knife edge, control members therefor, means for indepcndon tly moving said sharpening members toward the knife and means for preventing the engagement of oneof said members with the knife until after the other has engaged the knife, including a projection on one of said control members, and a flange on the other adapted to engage said projectlon when the control adapted normally it, a burr member with which the flange is associated and the sharpening member controlled thereby are in inoperative position.

4. In combination with a slicing machine having a rotary knife and means for driving it, a burr removing element adapted to enmover to the knife, yielding means, opposed thereto, tending normally to move said burr removing element toward the knife, yielding moans tending normally to hold the grinding element withdrawn from the knife, and an exteriorly operable thrust member adapted to thrust said grinding element, against said yielding means, toward the knife, and means for preventing actuation of said thrust member when the rotary member is in position to. hold the burr removing element out of knife contact.

5. In combination with a slicing machine having a rotary knife and means for driving removing element adapted to engage one side of the knife edge, a grinding element adapted to engage the opposite side of the knife edge, a rotary member adapted when in one position to hold said burr removing element out of contact with the knife and adapted, when rotated to another position, to permit the approach of said burr remover to the knife, yielding means, opposed thereto, tending normally to move said burr removing element toward the knife, yielding means tending normally to hold the grinding element withdrawn from the knife, and an exteriorly operable thrust member adapted to thrust said grinding element, against said yielding means, toward the knife, and means for preventing actuation of said thrust member when the rotary member is in position to hold the burr removing element out of knife contact, including a flange on said rotary member, normally opposed to the thrust member, the flange being formed to permit the passage of the thrust member when the rotary memberis rotated into position to release the burr removing element.

6. In combination with a slicing machine having a rotary knife, and means for driving it, a burr removing element adapted to engage one side of the knife edge, a grinding element adapted to engage the opposite side of the knife edge, a rotary member adapted when in one position to hold said burr removing element out of contact with the knife and adapted, when rotated to another position, to permit the approach of said burr remover to the knife, yielding means, opposed thereto, tending normally to move said burr removing element toward the Ill having a rotary knife, yielding means tending normally to hold the grinding element withdrawn from the knife, and an eXteriorly operable thrust member adapted to thrust said grinding ele ment, against said yielding means, toward the knife, means for preventing actuation of said thrust member when the'rotary member is in position to hold the burr removing element out of knife contact, including a flange on said rotary member normally opposed to the thrust member, the flange being formed to permit the passage of the thrust member when the rotary member is rotated into-inoperative position, and means for rotating said rotary member into operative position to hold the burr removing element inoperative, when the grinding element is with drawn from the knife.

7; In combination with a slicing machine knifeia-nd means for driving 1t, a burr removing element adapted to en'- gageone side of the knife edge,a grinding element adapted to engage the opposite side of the knife edge, a rotary member adapted;

when in one position to hold said burr removing element out of contact with the knife and adapted, when rotated to another position, to permit the approach of said burr remover to the knife, yielding means, opposed thereto, tending normally to move said burr removing element toward the knife, yielding means tending normally to ing element withdrawn from the knife, and an exteriorly operable thrust member adapted to thrust said grinding'element, against said yielding means, toward the knife, means for preventing actuation of said thrust member when the rotary member is in position to hold the burr removing element out of knife contact, including a flange on said rotary member, normally opposed :to the thrust member, the flange being formed to permit the passage of the thrust having a rotary knife and means for driving it, a burr removing element adapted to engage one side of the knife edge, yielding means tending normally to move it toward the knife edge, a cam member adapted, when in one position, to hold the burr removing element withdrawn from the knife edge, means for normally holding it in suchposition, a grinding element adapted to engage the opposite-side of the knife edge, yielding means tending normally to holdsaid grinding element withdrawn from the knife, an individual manually controlled member adapted to be opposed to said yielding means,

hold the grindhaving member, when the rotary member 1s rotated into inoperative poapproaching the ving member whereby the grinding element may be thrust into contact with the knife, said cam member normally opposing said control member, and to prevent movement of the grinding element toward the knife, said cam member being formed to permit movement of said control member and grinding element towardthe knife when the cam member is moved into position to release the burr removing element for contact with the knife edge. 7 I

9. In combination with a slicing machine havinga rotary knife and means for driving it, a burr removing element adapted to engagetone side of the knife edge, yielding means tending normally to move it tower the knife edge, a cam member in one position, to hold the vburr removing element withdrawn from the knife edge,

yielding meansrfor normally holding it in such position,a grinding element adapted engage the opposite side of the knife edge,

yielding means tending normally to hold said grinding element withdrawn from the knife, an individual; manually controlled member adapted ,to be opposed to said yielding means, whereby the grinding element may be thrust intocontact with the knife, said cam member i normally opposing said control member, and to prevent movement of the grinding element toward the knife, said cam member being formed to permit movement of said control member and grinding element toward the knife when the cam member is moved into position to release the burr removing element for contact with the knife edge, and a handle member associated with said cam and adapted to permit manual rotation of said cam against said yieldingmeans.

10. In association with a slicing machine a rotary knife and means for driving it, a burr removing member mounted to be presented to one side of the knife edge, a grinding member mounted to be presented to the opposite side of the knife edge, manually operable means for thrusting the grinding member into contact with the knife, yielding means for moving the burr removing member into contact with the knife and locking'means, operable against the grinding member only, adapted to prevent it from knife until the burr remov has engaged the knife.

11. In association with a slicing machine having a rotary knife and means for driving it, a burr removing member mounted to be presented to one side of the knife edge, a grinding; member mounted to be presented to the opposite ally operable means for thrusting the grinding member into contact with the, knife,

adapted, when side bf the knife edge, manuand for permitting itsyielding approach thereto, and locking means, associated with said manual control, adapted to prevent the grinding member from approaching the knife until the burr removing member has been released for enement with the knife. 12. In association with a slicing machine having a rotary knife and means for driving it, a burr removing member mounted to 10 be presented to one side of the knife edge, a grinding member mounted to be presented to the opposite side of theknife edge, manually operable means for thrust-' ing the grinding member into contact with .15 the knife, yielding means for moving the burr removm member into contact with the knife, manually operable means for normally holding said burr removing member out of contact with theknife, including a manually 20 rotatable member and yielding means for holding it normally in operative position, such locking means including a lateral proection from said manually rotatable mem 1' adapted to be rotated into inoperative '26 position in response to rotation of said manually rotatable member into osition to release the burr removing member for contact with the knife.

Si ed at Indianapolis, county of Marion and tate of Indiana, this 1st day of July,

WILLIAM J. CAMPBELL. 

